Basop Encoder: Noise introduced for Stereo DTX @32kbps
# Basic info
<!--- Add commit SHA used to reproduce -->
- Float reference:
- Encoder (float):https://forge.3gpp.org/rep/sa4/audio/ivas-basop/-/commit/b09a7f47a1bc3834f69b23a7337059451f5e7e9a
- Decoder (float):https://forge.3gpp.org/rep/sa4/audio/ivas-basop/-/commit/b09a7f47a1bc3834f69b23a7337059451f5e7e9a
- Fixed point:
- Encoder (fixed):https://forge.3gpp.org/rep/sa4/audio/ivas-basop/-/commit/4c0dfa80330093975f361decb3607afbde9b5486
- Decoder (fixed):
# Bug description
A noise is introduced at the end of the signal (around 7.5s) for a duration of approximately 0.5 seconds between 0 and 8kHz for unified stereo dtx at 32kbps.
Float:

Fixed:

# Ways to reproduce
Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-1247
<!-- Commandline or script -->
```bash
./IVAS_cod_ref.exe -dtx -stereo 32000 48 si_input.wav bitref
./IVAS_dec_ref.exe Stereo 48 bitref out_ref.wav
./IVAS_cod.exe -dtx -stereo 32000 48 si_input.wav bit
./IVAS_dec_ref.exe Stereo 48 bit out_dut.wav
```
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issue